【摘要】：草枯醚作為一種二苯醚類除草劑,曾在20世紀70~90年代大量使用,是一種典型的持久性有機污染物.禁用20年來,其在水、土壤環(huán)境中仍有檢出,嚴重威脅農(nóng)業(yè)生態(tài)安全.實驗采用縮水甘油醚對前期制備的腐植酸酯(HAE)進行化學改性,調(diào)控合成強疏水性的腐植酸酯醚(HAEE)吸附材料,用于水中草枯醚吸附去除.通過傅里葉紅外光譜表征、疏水角測定,可以表明HAEE不僅保留了芳香核和類酯結構,同時疏水角由改性前的30°提高到96°.此外,通過HAEE對水中草枯醚的吸附行為,探究HAEE對水中草枯醚農(nóng)藥污染的修復機制,結果表明:HAEE對草枯醚的吸附量隨疏水性的增強而增大;吸附在2.0h即達平衡;并符合Lagergren二級動力學方程;吸附等溫線契合Freundlich模型;HAEE經(jīng)5次再生后,對草枯醚的去除率仍在78%以上.HAEE對草枯醚的吸附機制以疏水分配和π-π作用為主.實驗制備的疏水性HAEE對草枯醚的吸附,可為水、土壤環(huán)境中草枯醚的污染修復提供理論依據(jù).
[Abstract]:As a diphenyl ether herbicide, grass withered ether was widely used in the 1970s and 1990s. It is a typical persistent organic pollutant. In the past 20 years, it has been detected in water and soil environment, which is a serious threat to agricultural ecological security. Glycidyl ether (glycidyl ether) was used to chemically modify the humic acid ester (HAE) prepared in the early stage, and to control the synthesis of strong hydrophobic humic acid ester ether (HAEE) adsorption material for the adsorption and removal of grass withered ether in water. Fourier transform infrared spectroscopy (FTIR) analysis and hydrophobic angle measurement showed that HAEE not only retained aromatic nuclei and ester like structures, but also increased the hydrophobic angle from 30 擄to 96 擄. In addition, through the adsorption behavior of HAEE to grass withered ether in water, the mechanism of HAEE remediation of grass withered ether pesticide pollution in water was explored. The results showed that the adsorption capacity of HAEE on grass withered ether increased with the increase of hydrophobicity, and reached equilibrium at 2.0 h. The adsorption isotherm fits the Freundlich model, and the removal rate of HAEE is still over 78% after five regeneration. The adsorption mechanism of HAEE on grass withered ether is mainly hydrophobic partitioning and 蟺-蟺 interaction. The hydrophobic HAEE prepared in the experiment can provide theoretical basis for the remediation of grass withered ether pollution in water and soil environment.
【作者單位】： 四川師范大學化學與材料科學學院;
【基金】：國家自然科學基金(51641209)
【分類號】：X592
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本文編號：2403939